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<head>
    <meta charset="UTF-8">
   
    <title>Document</title>
    <script src="../jQuery.js"></script>
    <script>
        $(function(){
            $("#a2").next("p").css("color","red");
            $("#a1>p").css("color","green");
        })
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<body>
    <div id="a1">
        <P>qwe</P>
        <P>9000</P>
        <div id="#a2">
            <p>980</p>
            <p>888</p>
        </div>
        <p>7000</p>
        <p>70000000</p>
    </div>
</body>
</html>